Description: This an oscilloscope program written in c using the XForms library.
It uses the PC s parallel port for data input. The way it s done is as follows:
first data bit 1 is set to 1 then to 0 to enable the a-to-d converter
( ADC0801 ), then we read 4 bits of data from the multiplexer ( 74LS157 )
placed after the a-to-d, then a 1 is sent to the second data bit and the other
four bits of data are read. The circuit is setup as follows:
---------------------------------------------------------<---- Data bit 1
|
| ---------------- --------------
| | D0|-------->----------| Select|----<---- Data bit 2
|---|Enable D1|-------->----------| |
From | D2|-------->----------| O0|---->---- Status bit 4
Circuit->--|Ain D3|-------->----------| O1|---->---- Status bit 5
| D4|
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117143191oscope-1.5.tar
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